No serial since kernel 3.8

No serial since kernel 3.8

[Stephan von Krawczynski]

Hello,

can some kind soul please explain how I can get my serial port back under
kernel 3.8.X. Earlier kernels showed:

Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
(irq = 4) is a 16550A

But 3.8.4:

Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled

Only kernel is replaced, no change in distro
Is there some kernel boot parameter needed now?
I tried 3.4.X and it works, even 3.7.X works...

-- 
Regards,
Stephan

Re: No serial since kernel 3.8

[richard -rw- weinberger]

On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
<skraw@ithnet.com> wrote:
> Hello,
>
> can some kind soul please explain how I can get my serial port back under
> kernel 3.8.X. Earlier kernels showed:
>
> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
> (irq = 4) is a 16550A
>
> But 3.8.4:
>
> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
>
> Only kernel is replaced, no change in distro
> Is there some kernel boot parameter needed now?
> I tried 3.4.X and it works, even 3.7.X works...

So, 3.8.3 worked and 3.8.4 introduced a regression?
If so please confirm.

CC'ing gregkh, just in case...

--
Thanks,
//richard

Re: No serial since kernel 3.8

[Josh Boyer]

On Tue, Apr 16, 2013 at 04:55:25PM +0200, richard -rw- weinberger wrote:
>On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
><skraw@ithnet.com> wrote:
>> Hello,
>>
>> can some kind soul please explain how I can get my serial port back under
>> kernel 3.8.X. Earlier kernels showed:
>>
>> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
>> (irq = 4) is a 16550A
>>
>> But 3.8.4:
>>
>> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
>>
>> Only kernel is replaced, no change in distro
>> Is there some kernel boot parameter needed now?
>> I tried 3.4.X and it works, even 3.7.X works...
>
>So, 3.8.3 worked and 3.8.4 introduced a regression?
>If so please confirm.
>
>CC'ing gregkh, just in case...

We had a report of this in Fedora that was fixed with 3.8.7.  An upstream
change had been brought back to the 3.8.x series, and it was subsequently
reverted.  3.8.7 picked up the revert.

josh

Re: No serial since kernel 3.8

[Stephan von Krawczynski]

On Tue, 16 Apr 2013 16:55:25 +0200
richard -rw- weinberger <richard.weinberger@gmail.com> wrote:

> On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
> <skraw@ithnet.com> wrote:
> > Hello,
> >
> > can some kind soul please explain how I can get my serial port back under
> > kernel 3.8.X. Earlier kernels showed:
> >
> > Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
> > (irq = 4) is a 16550A
> >
> > But 3.8.4:
> >
> > Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
> >
> > Only kernel is replaced, no change in distro
> > Is there some kernel boot parameter needed now?
> > I tried 3.4.X and it works, even 3.7.X works...
> 
> So, 3.8.3 worked and 3.8.4 introduced a regression?
> If so please confirm.
> 
> CC'ing gregkh, just in case...

No, neither 3.8.4 nor 3.8.3 worked. The last working version I know for sure is 3.7.6
FYI: I don't load serial as a module
-- 
Regards,
Stephan

Re: No serial since kernel 3.8

[Stephan von Krawczynski]

On Tue, 16 Apr 2013 10:59:53 -0400
Josh Boyer <jwboyer@gmail.com> wrote:

> On Tue, Apr 16, 2013 at 04:55:25PM +0200, richard -rw- weinberger wrote:
> >On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
> ><skraw@ithnet.com> wrote:
> >> Hello,
> >>
> >> can some kind soul please explain how I can get my serial port back under
> >> kernel 3.8.X. Earlier kernels showed:
> >>
> >> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
> >> (irq = 4) is a 16550A
> >>
> >> But 3.8.4:
> >>
> >> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
> >>
> >> Only kernel is replaced, no change in distro
> >> Is there some kernel boot parameter needed now?
> >> I tried 3.4.X and it works, even 3.7.X works...
> >
> >So, 3.8.3 worked and 3.8.4 introduced a regression?
> >If so please confirm.
> >
> >CC'ing gregkh, just in case...
> 
> We had a report of this in Fedora that was fixed with 3.8.7.  An upstream
> change had been brought back to the 3.8.x series, and it was subsequently
> reverted.  3.8.7 picked up the revert.
> 
> josh

3.8.7 does not work either. I just checked it. I tried shared and not shared IRQ:

Apr 16 17:47:05 mybox kernel: [    0.604826] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled

and another test:

Apr 16 18:07:08 mybox kernel: [    0.601203] Serial: 8250/16550 driver, 8 ports, IRQ sharing enabled

I must say that 3.8.7 does not even tell the "serial 00:0a: disabled" any more.
This is no special board, it is a pretty mainstream asus xeon board with onboard serial.
Loading 3.4.24 (just an example) makes the port work immediately.
Anything else I can test?

-- 
Regards,
Stephan

Re: No serial since kernel 3.8

[Bjorn Helgaas]

[+cc Rafael & linux-acpi]

On Tue, Apr 16, 2013 at 10:14 AM, Stephan von Krawczynski
<skraw@ithnet.com> wrote:
> On Tue, 16 Apr 2013 10:59:53 -0400
> Josh Boyer <jwboyer@gmail.com> wrote:
>
>> On Tue, Apr 16, 2013 at 04:55:25PM +0200, richard -rw- weinberger wrote:
>> >On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
>> ><skraw@ithnet.com> wrote:
>> >> Hello,
>> >>
>> >> can some kind soul please explain how I can get my serial port back under
>> >> kernel 3.8.X. Earlier kernels showed:
>> >>
>> >> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
>> >> (irq = 4) is a 16550A
>> >>
>> >> But 3.8.4:
>> >>
>> >> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
>> >>
>> >> Only kernel is replaced, no change in distro
>> >> Is there some kernel boot parameter needed now?
>> >> I tried 3.4.X and it works, even 3.7.X works...
>> >
>> >So, 3.8.3 worked and 3.8.4 introduced a regression?
>> >If so please confirm.
>> >
>> >CC'ing gregkh, just in case...
>>
>> We had a report of this in Fedora that was fixed with 3.8.7.  An upstream
>> change had been brought back to the 3.8.x series, and it was subsequently
>> reverted.  3.8.7 picked up the revert.
>>
>> josh
>
> 3.8.7 does not work either. I just checked it. I tried shared and not shared IRQ:
>
> Apr 16 17:47:05 mybox kernel: [    0.604826] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
>
> and another test:
>
> Apr 16 18:07:08 mybox kernel: [    0.601203] Serial: 8250/16550 driver, 8 ports, IRQ sharing enabled
>
> I must say that 3.8.7 does not even tell the "serial 00:0a: disabled" any more.
> This is no special board, it is a pretty mainstream asus xeon board with onboard serial.
> Loading 3.4.24 (just an example) makes the port work immediately.
> Anything else I can test?

3.7.6 works, and 3.8.3, 3.8.4, 3.8.7 all fail.  So it looks like a
regression between 3.7.6 and 3.8.3.

The "serial 00:0a: disabled" message is from PNP, so I added Rafael
and linux-acpi.  Complete dmesg logs from 3.7.6 and 3.8.4 would be a
place to start.  Also maybe an acpidump, since the 00:0a PNP device
probably came from PNPACPI.  You could attach all these to a
https://bugzilla.kernel.org report if you want a place to stash them.

Josh, do you have a pointer (URL) to the Fedora issue so we can rule
that in or out?

Bjorn

Re: No serial since kernel 3.8

[Josh Boyer]

On Wed, Apr 17, 2013 at 11:38:30AM -0600, Bjorn Helgaas wrote:
>[+cc Rafael & linux-acpi]
>
>On Tue, Apr 16, 2013 at 10:14 AM, Stephan von Krawczynski
><skraw@ithnet.com> wrote:
>> On Tue, 16 Apr 2013 10:59:53 -0400
>> Josh Boyer <jwboyer@gmail.com> wrote:
>>
>>> On Tue, Apr 16, 2013 at 04:55:25PM +0200, richard -rw- weinberger wrote:
>>> >On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
>>> ><skraw@ithnet.com> wrote:
>>> >> Hello,
>>> >>
>>> >> can some kind soul please explain how I can get my serial port back under
>>> >> kernel 3.8.X. Earlier kernels showed:
>>> >>
>>> >> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
>>> >> (irq = 4) is a 16550A
>>> >>
>>> >> But 3.8.4:
>>> >>
>>> >> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
>>> >>
>>> >> Only kernel is replaced, no change in distro
>>> >> Is there some kernel boot parameter needed now?
>>> >> I tried 3.4.X and it works, even 3.7.X works...
>>> >
>>> >So, 3.8.3 worked and 3.8.4 introduced a regression?
>>> >If so please confirm.
>>> >
>>> >CC'ing gregkh, just in case...
>>>
>>> We had a report of this in Fedora that was fixed with 3.8.7.  An upstream
>>> change had been brought back to the 3.8.x series, and it was subsequently
>>> reverted.  3.8.7 picked up the revert.
>>>
>>> josh
>>
>> 3.8.7 does not work either. I just checked it. I tried shared and not shared IRQ:
>>
>> Apr 16 17:47:05 mybox kernel: [    0.604826] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
>>
>> and another test:
>>
>> Apr 16 18:07:08 mybox kernel: [    0.601203] Serial: 8250/16550 driver, 8 ports, IRQ sharing enabled
>>
>> I must say that 3.8.7 does not even tell the "serial 00:0a: disabled" any more.
>> This is no special board, it is a pretty mainstream asus xeon board with onboard serial.
>> Loading 3.4.24 (just an example) makes the port work immediately.
>> Anything else I can test?
>
>3.7.6 works, and 3.8.3, 3.8.4, 3.8.7 all fail.  So it looks like a
>regression between 3.7.6 and 3.8.3.
>
>The "serial 00:0a: disabled" message is from PNP, so I added Rafael
>and linux-acpi.  Complete dmesg logs from 3.7.6 and 3.8.4 would be a
>place to start.  Also maybe an acpidump, since the 00:0a PNP device
>probably came from PNPACPI.  You could attach all these to a
>https://bugzilla.kernel.org report if you want a place to stash them.
>
>Josh, do you have a pointer (URL) to the Fedora issue so we can rule
>that in or out?

https://lkml.org/lkml/2013/4/2/426 is the upstream thread.  Seems that
was narrowed down to 3.8.4 though, not 3.8.3.

josh

Re: No serial since kernel 3.8

[Greg KH]

On Tue, Apr 16, 2013 at 06:10:06PM +0200, Stephan von Krawczynski wrote:
> On Tue, 16 Apr 2013 16:55:25 +0200
> richard -rw- weinberger <richard.weinberger@gmail.com> wrote:
> 
> > On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
> > <skraw@ithnet.com> wrote:
> > > Hello,
> > >
> > > can some kind soul please explain how I can get my serial port back under
> > > kernel 3.8.X. Earlier kernels showed:
> > >
> > > Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
> > > (irq = 4) is a 16550A
> > >
> > > But 3.8.4:
> > >
> > > Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
> > >
> > > Only kernel is replaced, no change in distro
> > > Is there some kernel boot parameter needed now?
> > > I tried 3.4.X and it works, even 3.7.X works...
> > 
> > So, 3.8.3 worked and 3.8.4 introduced a regression?
> > If so please confirm.
> > 
> > CC'ing gregkh, just in case...
> 
> No, neither 3.8.4 nor 3.8.3 worked. The last working version I know for sure is 3.7.6
> FYI: I don't load serial as a module

Can you run 'git bisect' between those kernels to track down the
offending commit?

thanks,

greg k-h

Re: No serial since kernel 3.8

[Rafael J. Wysocki]

On Wednesday, April 17, 2013 11:38:30 AM Bjorn Helgaas wrote:
> [+cc Rafael & linux-acpi]

Thanks.

> On Tue, Apr 16, 2013 at 10:14 AM, Stephan von Krawczynski
> <skraw@ithnet.com> wrote:
> > On Tue, 16 Apr 2013 10:59:53 -0400
> > Josh Boyer <jwboyer@gmail.com> wrote:
> >
> >> On Tue, Apr 16, 2013 at 04:55:25PM +0200, richard -rw- weinberger wrote:
> >> >On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
> >> ><skraw@ithnet.com> wrote:
> >> >> Hello,
> >> >>
> >> >> can some kind soul please explain how I can get my serial port back under
> >> >> kernel 3.8.X. Earlier kernels showed:
> >> >>
> >> >> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
> >> >> (irq = 4) is a 16550A
> >> >>
> >> >> But 3.8.4:
> >> >>
> >> >> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
> >> >>
> >> >> Only kernel is replaced, no change in distro
> >> >> Is there some kernel boot parameter needed now?
> >> >> I tried 3.4.X and it works, even 3.7.X works...
> >> >
> >> >So, 3.8.3 worked and 3.8.4 introduced a regression?
> >> >If so please confirm.
> >> >
> >> >CC'ing gregkh, just in case...
> >>
> >> We had a report of this in Fedora that was fixed with 3.8.7.  An upstream
> >> change had been brought back to the 3.8.x series, and it was subsequently
> >> reverted.  3.8.7 picked up the revert.
> >>
> >> josh
> >
> > 3.8.7 does not work either. I just checked it. I tried shared and not shared IRQ:
> >
> > Apr 16 17:47:05 mybox kernel: [    0.604826] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
> >
> > and another test:
> >
> > Apr 16 18:07:08 mybox kernel: [    0.601203] Serial: 8250/16550 driver, 8 ports, IRQ sharing enabled
> >
> > I must say that 3.8.7 does not even tell the "serial 00:0a: disabled" any more.
> > This is no special board, it is a pretty mainstream asus xeon board with onboard serial.
> > Loading 3.4.24 (just an example) makes the port work immediately.
> > Anything else I can test?
> 
> 3.7.6 works, and 3.8.3, 3.8.4, 3.8.7 all fail.  So it looks like a
> regression between 3.7.6 and 3.8.3.
> 
> The "serial 00:0a: disabled" message is from PNP, so I added Rafael
> and linux-acpi.  Complete dmesg logs from 3.7.6 and 3.8.4 would be a
> place to start.  Also maybe an acpidump, since the 00:0a PNP device
> probably came from PNPACPI.  You could attach all these to a
> https://bugzilla.kernel.org report if you want a place to stash them.
> 
> Josh, do you have a pointer (URL) to the Fedora issue so we can rule
> that in or out?

Stephan, below is a list of commits touching the PNP code between 3.7 and 3.8.

Can you please check if any of them has triggered the problem you're seeing?

Rafael


13cde3b PNP: Handle IORESOURCE_BITS in resource allocation
c937766 PNP: Simplify setting of resources
cdc87c5 pnpacpi: fix incorrect TEST_ALPHA() test
a6b5e88 ACPI / PNP: Do not crash due to stale pointer use during system resume
38de279 pnpbios: remove CONFIG_HOTPLUG ifdefs
2905875 ACPI / PNP: skip ACPI device nodes associated with physical nodes already
046d9ce ACPI: Move device resources interpretation code from PNP to ACPI core

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.

Re: No serial since kernel 3.8

[Stephan von Krawczynski]

On Wed, 17 Apr 2013 20:55:04 +0200
"Rafael J. Wysocki" <rjw@sisk.pl> wrote:

> On Wednesday, April 17, 2013 11:38:30 AM Bjorn Helgaas wrote:
> > [+cc Rafael & linux-acpi]
> 
> Thanks.
> 
> > On Tue, Apr 16, 2013 at 10:14 AM, Stephan von Krawczynski
> > <skraw@ithnet.com> wrote:
> > > On Tue, 16 Apr 2013 10:59:53 -0400
> > > Josh Boyer <jwboyer@gmail.com> wrote:
> > >
> > >> On Tue, Apr 16, 2013 at 04:55:25PM +0200, richard -rw- weinberger wrote:
> > >> >On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
> > >> ><skraw@ithnet.com> wrote:
> > >> >> Hello,
> > >> >>
> > >> >> can some kind soul please explain how I can get my serial port back under
> > >> >> kernel 3.8.X. Earlier kernels showed:
> > >> >>
> > >> >> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
> > >> >> (irq = 4) is a 16550A
> > >> >>
> > >> >> But 3.8.4:
> > >> >>
> > >> >> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
> > >> >>
> > >> >> Only kernel is replaced, no change in distro
> > >> >> Is there some kernel boot parameter needed now?
> > >> >> I tried 3.4.X and it works, even 3.7.X works...
> > >> >
> > >> >So, 3.8.3 worked and 3.8.4 introduced a regression?
> > >> >If so please confirm.
> > >> >
> > >> >CC'ing gregkh, just in case...
> > >>
> > >> We had a report of this in Fedora that was fixed with 3.8.7.  An upstream
> > >> change had been brought back to the 3.8.x series, and it was subsequently
> > >> reverted.  3.8.7 picked up the revert.
> > >>
> > >> josh
> > >
> > > 3.8.7 does not work either. I just checked it. I tried shared and not shared IRQ:
> > >
> > > Apr 16 17:47:05 mybox kernel: [    0.604826] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
> > >
> > > and another test:
> > >
> > > Apr 16 18:07:08 mybox kernel: [    0.601203] Serial: 8250/16550 driver, 8 ports, IRQ sharing enabled
> > >
> > > I must say that 3.8.7 does not even tell the "serial 00:0a: disabled" any more.
> > > This is no special board, it is a pretty mainstream asus xeon board with onboard serial.
> > > Loading 3.4.24 (just an example) makes the port work immediately.
> > > Anything else I can test?
> > 
> > 3.7.6 works, and 3.8.3, 3.8.4, 3.8.7 all fail.  So it looks like a
> > regression between 3.7.6 and 3.8.3.
> > 
> > The "serial 00:0a: disabled" message is from PNP, so I added Rafael
> > and linux-acpi.  Complete dmesg logs from 3.7.6 and 3.8.4 would be a
> > place to start.  Also maybe an acpidump, since the 00:0a PNP device
> > probably came from PNPACPI.  You could attach all these to a
> > https://bugzilla.kernel.org report if you want a place to stash them.
> > 
> > Josh, do you have a pointer (URL) to the Fedora issue so we can rule
> > that in or out?
> 
> Stephan, below is a list of commits touching the PNP code between 3.7 and 3.8.
> 
> Can you please check if any of them has triggered the problem you're seeing?
> 
> Rafael
> 
> 
> 13cde3b PNP: Handle IORESOURCE_BITS in resource allocation
> c937766 PNP: Simplify setting of resources
> cdc87c5 pnpacpi: fix incorrect TEST_ALPHA() test
> a6b5e88 ACPI / PNP: Do not crash due to stale pointer use during system resume
> 38de279 pnpbios: remove CONFIG_HOTPLUG ifdefs
> 2905875 ACPI / PNP: skip ACPI device nodes associated with physical nodes already
> 046d9ce ACPI: Move device resources interpretation code from PNP to ACPI core
> 
> -- 
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.

Hello all,

I checked 3.8.8 today and it _does_ work.
Shall we burn some time to find out why?
The only significant output difference between working and not working we could find is:

not working:
Apr  2 17:28:23 mybox kernel: [    0.603270] serial 00:0a: disabled

working (3.8.8):
Apr 18 12:58:50 mybox kernel: [    2.855929] 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

-- 
Regards,
Stephan

Re: No serial since kernel 3.8

[Greg KH]

On Thu, Apr 18, 2013 at 01:15:27PM +0200, Stephan von Krawczynski wrote:
> On Wed, 17 Apr 2013 20:55:04 +0200
> "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
> 
> > On Wednesday, April 17, 2013 11:38:30 AM Bjorn Helgaas wrote:
> > > [+cc Rafael & linux-acpi]
> > 
> > Thanks.
> > 
> > > On Tue, Apr 16, 2013 at 10:14 AM, Stephan von Krawczynski
> > > <skraw@ithnet.com> wrote:
> > > > On Tue, 16 Apr 2013 10:59:53 -0400
> > > > Josh Boyer <jwboyer@gmail.com> wrote:
> > > >
> > > >> On Tue, Apr 16, 2013 at 04:55:25PM +0200, richard -rw- weinberger wrote:
> > > >> >On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
> > > >> ><skraw@ithnet.com> wrote:
> > > >> >> Hello,
> > > >> >>
> > > >> >> can some kind soul please explain how I can get my serial port back under
> > > >> >> kernel 3.8.X. Earlier kernels showed:
> > > >> >>
> > > >> >> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
> > > >> >> (irq = 4) is a 16550A
> > > >> >>
> > > >> >> But 3.8.4:
> > > >> >>
> > > >> >> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
> > > >> >>
> > > >> >> Only kernel is replaced, no change in distro
> > > >> >> Is there some kernel boot parameter needed now?
> > > >> >> I tried 3.4.X and it works, even 3.7.X works...
> > > >> >
> > > >> >So, 3.8.3 worked and 3.8.4 introduced a regression?
> > > >> >If so please confirm.
> > > >> >
> > > >> >CC'ing gregkh, just in case...
> > > >>
> > > >> We had a report of this in Fedora that was fixed with 3.8.7.  An upstream
> > > >> change had been brought back to the 3.8.x series, and it was subsequently
> > > >> reverted.  3.8.7 picked up the revert.
> > > >>
> > > >> josh
> > > >
> > > > 3.8.7 does not work either. I just checked it. I tried shared and not shared IRQ:
> > > >
> > > > Apr 16 17:47:05 mybox kernel: [    0.604826] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
> > > >
> > > > and another test:
> > > >
> > > > Apr 16 18:07:08 mybox kernel: [    0.601203] Serial: 8250/16550 driver, 8 ports, IRQ sharing enabled
> > > >
> > > > I must say that 3.8.7 does not even tell the "serial 00:0a: disabled" any more.
> > > > This is no special board, it is a pretty mainstream asus xeon board with onboard serial.
> > > > Loading 3.4.24 (just an example) makes the port work immediately.
> > > > Anything else I can test?
> > > 
> > > 3.7.6 works, and 3.8.3, 3.8.4, 3.8.7 all fail.  So it looks like a
> > > regression between 3.7.6 and 3.8.3.
> > > 
> > > The "serial 00:0a: disabled" message is from PNP, so I added Rafael
> > > and linux-acpi.  Complete dmesg logs from 3.7.6 and 3.8.4 would be a
> > > place to start.  Also maybe an acpidump, since the 00:0a PNP device
> > > probably came from PNPACPI.  You could attach all these to a
> > > https://bugzilla.kernel.org report if you want a place to stash them.
> > > 
> > > Josh, do you have a pointer (URL) to the Fedora issue so we can rule
> > > that in or out?
> > 
> > Stephan, below is a list of commits touching the PNP code between 3.7 and 3.8.
> > 
> > Can you please check if any of them has triggered the problem you're seeing?
> > 
> > Rafael
> > 
> > 
> > 13cde3b PNP: Handle IORESOURCE_BITS in resource allocation
> > c937766 PNP: Simplify setting of resources
> > cdc87c5 pnpacpi: fix incorrect TEST_ALPHA() test
> > a6b5e88 ACPI / PNP: Do not crash due to stale pointer use during system resume
> > 38de279 pnpbios: remove CONFIG_HOTPLUG ifdefs
> > 2905875 ACPI / PNP: skip ACPI device nodes associated with physical nodes already
> > 046d9ce ACPI: Move device resources interpretation code from PNP to ACPI core
> > 
> > -- 
> > I speak only for myself.
> > Rafael J. Wysocki, Intel Open Source Technology Center.
> 
> Hello all,
> 
> I checked 3.8.8 today and it _does_ work.
> Shall we burn some time to find out why?
> The only significant output difference between working and not working we could find is:
> 
> not working:
> Apr  2 17:28:23 mybox kernel: [    0.603270] serial 00:0a: disabled
> 
> working (3.8.8):
> Apr 18 12:58:50 mybox kernel: [    2.855929] 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

If you are curious, you can run 'git bisect' to figure out the fix, but
if you look at the commits in these 3.8.x releases, I think it will be
pretty obvious as to what specific patch fixed it :)

Thanks for letting us know,

greg k-h

Re: No serial since kernel 3.8

[Rafael J. Wysocki]

On Thursday, April 18, 2013 01:15:27 PM Stephan von Krawczynski wrote:
> On Wed, 17 Apr 2013 20:55:04 +0200
> "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
> 
> > On Wednesday, April 17, 2013 11:38:30 AM Bjorn Helgaas wrote:
> > > [+cc Rafael & linux-acpi]
> > 
> > Thanks.
> > 
> > > On Tue, Apr 16, 2013 at 10:14 AM, Stephan von Krawczynski
> > > <skraw@ithnet.com> wrote:
> > > > On Tue, 16 Apr 2013 10:59:53 -0400
> > > > Josh Boyer <jwboyer@gmail.com> wrote:
> > > >
> > > >> On Tue, Apr 16, 2013 at 04:55:25PM +0200, richard -rw- weinberger wrote:
> > > >> >On Tue, Apr 16, 2013 at 4:20 PM, Stephan von Krawczynski
> > > >> ><skraw@ithnet.com> wrote:
> > > >> >> Hello,
> > > >> >>
> > > >> >> can some kind soul please explain how I can get my serial port back under
> > > >> >> kernel 3.8.X. Earlier kernels showed:
> > > >> >>
> > > >> >> Jan 10 13:57:18 mybox kernel: [    0.712829] serial8250: ttyS0 at I/O 0x3f8
> > > >> >> (irq = 4) is a 16550A
> > > >> >>
> > > >> >> But 3.8.4:
> > > >> >>
> > > >> >> Mar 26 10:39:14 admin kernel: [    0.603647] serial 00:0a: disabled
> > > >> >>
> > > >> >> Only kernel is replaced, no change in distro
> > > >> >> Is there some kernel boot parameter needed now?
> > > >> >> I tried 3.4.X and it works, even 3.7.X works...
> > > >> >
> > > >> >So, 3.8.3 worked and 3.8.4 introduced a regression?
> > > >> >If so please confirm.
> > > >> >
> > > >> >CC'ing gregkh, just in case...
> > > >>
> > > >> We had a report of this in Fedora that was fixed with 3.8.7.  An upstream
> > > >> change had been brought back to the 3.8.x series, and it was subsequently
> > > >> reverted.  3.8.7 picked up the revert.
> > > >>
> > > >> josh
> > > >
> > > > 3.8.7 does not work either. I just checked it. I tried shared and not shared IRQ:
> > > >
> > > > Apr 16 17:47:05 mybox kernel: [    0.604826] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
> > > >
> > > > and another test:
> > > >
> > > > Apr 16 18:07:08 mybox kernel: [    0.601203] Serial: 8250/16550 driver, 8 ports, IRQ sharing enabled
> > > >
> > > > I must say that 3.8.7 does not even tell the "serial 00:0a: disabled" any more.
> > > > This is no special board, it is a pretty mainstream asus xeon board with onboard serial.
> > > > Loading 3.4.24 (just an example) makes the port work immediately.
> > > > Anything else I can test?
> > > 
> > > 3.7.6 works, and 3.8.3, 3.8.4, 3.8.7 all fail.  So it looks like a
> > > regression between 3.7.6 and 3.8.3.
> > > 
> > > The "serial 00:0a: disabled" message is from PNP, so I added Rafael
> > > and linux-acpi.  Complete dmesg logs from 3.7.6 and 3.8.4 would be a
> > > place to start.  Also maybe an acpidump, since the 00:0a PNP device
> > > probably came from PNPACPI.  You could attach all these to a
> > > https://bugzilla.kernel.org report if you want a place to stash them.
> > > 
> > > Josh, do you have a pointer (URL) to the Fedora issue so we can rule
> > > that in or out?
> > 
> > Stephan, below is a list of commits touching the PNP code between 3.7 and 3.8.
> > 
> > Can you please check if any of them has triggered the problem you're seeing?
> > 
> > Rafael
> > 
> > 
> > 13cde3b PNP: Handle IORESOURCE_BITS in resource allocation
> > c937766 PNP: Simplify setting of resources
> > cdc87c5 pnpacpi: fix incorrect TEST_ALPHA() test
> > a6b5e88 ACPI / PNP: Do not crash due to stale pointer use during system resume
> > 38de279 pnpbios: remove CONFIG_HOTPLUG ifdefs
> > 2905875 ACPI / PNP: skip ACPI device nodes associated with physical nodes already
> > 046d9ce ACPI: Move device resources interpretation code from PNP to ACPI core
> > 
> 
> Hello all,
> 
> I checked 3.8.8 today and it _does_ work.

Great!

> Shall we burn some time to find out why?

Only if you want to know. :-)

> The only significant output difference between working and not working we could find is:
> 
> not working:
> Apr  2 17:28:23 mybox kernel: [    0.603270] serial 00:0a: disabled
> 
> working (3.8.8):
> Apr 18 12:58:50 mybox kernel: [    2.855929] 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

Thanks for the info
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.